Problem with the pressure in combi boiler?
Valiant thermostat , BMU-Err ?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Vaillant eco plus 531 boiler?
my vaillant boiler is saying a code com on it ?
how do I vent the heat exchanger?
Vaillant vcw gb242 eh central heating problem?
Why is heating on at night?
Vaillant 828E - no hot water?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?
my boiler will no work?
how to fix water pressure its down at bottom of grey part?
Advice?
vaillant ecoTEC plus boiler fault code - how to fix?
how do I rectify the fault as detailed below?